Cut potato into wedge shape. Crush ginger and garlic gently with back of ladle. Set aside.
Set Instant pot to ‘Sauté’ mode.
Add vegetable oil and cumin seeds. Allow it to splutter.
Add chopped onion, and sauté until it becomes translucent.
Then add ginger, garlic, serrano peppers, and tomatoes. And sauté until it becomes soft.
Add red chili powder and ground turmeric. Sauté for 20 seconds.
Add potato wedges, salt and water. Close the lid.
Set the Instant pot manually for 7 minutes.
Once cooked, wait for 10 minutes to release the pressure.
Open the lid, gently mash 25% of the potato make the curry thicker.
Transfer to serving bowl, and garnish with cilantro.
Serve hot as a side dish.
Notes
Adjust the spice level by increasing or reducing serrano peppers and red chili powder based on your heat tolerance.
You can substitute fresh tomatoes with canned crushed tomatoes and swap serrano peppers with Thai green chilies.
Store leftovers in an airtight container in the refrigerator for up to 3 days or freeze for up to 2 months. Thaw overnight and reheat with a splash of water.